详细说明：ORL人脸库，可以用于人脸识别和人脸检测！

文件列表:
  ORL
  ...\s1
  ...\..\1.pgm
  ...\..\10.pgm
  ...\..\2.pgm
  ...\..\3.pgm
  ...\..\4.pgm
  ...\..\5.pgm
  ...\..\6.pgm
  ...\..\7.pgm
  ...\..\8.pgm
  ...\..\9.pgm
  ...\s10
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ...\...\3.pgm
  ...\...\4.pgm
  ...\...\5.pgm
  ...\...\6.pgm
  ...\...\7.pgm
  ...\...\8.pgm
  ...\...\9.pgm
  ...\s11
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ...\...\3.pgm
  ...\...\4.pgm
  ...\...\5.pgm
  ...\...\6.pgm
  ...\...\7.pgm
  ...\...\8.pgm
  ...\...\9.pgm
  ...\s12
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ...\...\3.pgm
  ...\...\4.pgm
  ...\...\5.pgm
  ...\...\6.pgm
  ...\...\7.pgm
  ...\...\8.pgm
  ...\...\9.pgm
  ...\s13
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ...\...\3.pgm
  ...\...\4.pgm
  ...\...\5.pgm
  ...\...\6.pgm
  ...\...\7.pgm
  ...\...\8.pgm
  ...\...\9.pgm
  ...\s14
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ...\...\3.pgm
  ...\...\4.pgm
  ...\...\5.pgm
  ...\...\6.pgm
  ...\...\7.pgm
  ...\...\8.pgm
  ...\...\9.pgm
  ...\s15
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ...\...\3.pgm
  ...\...\4.pgm
  ...\...\5.pgm
  ...\...\6.pgm
  ...\...\7.pgm
  ...\...\8.pgm
  ...\...\9.pgm
  ...\s16
  ...\...\1.pgm
  ...\...\10.pgm
  ...\...\2.pgm
  ... ...